Os, Sr, Nd, Pb, O isotope and trace element data from the Ferrar flood basalts, antarctica: evidence for an enriched subcontinental lithospheric source
International audience OS, Sr, Nd, Pb and 0 isotopes and trace element data are reported for basaltic andesite and andesite whole rocks and, in part, for selected mineral separates from the Jurassic Ferrar flood basalt province. Radiogenic Sr (> 0.709), unradiogenic Nd (e Nd =-3 to-5), and radiog...
Published in: | Earth and Planetary Science Letters |
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ftccsdartic:oai:HAL:hal-02970609v1 2023-05-15T13:45:04+02:00 Os, Sr, Nd, Pb, O isotope and trace element data from the Ferrar flood basalts, antarctica: evidence for an enriched subcontinental lithospheric source Molzahn, M. Reisberg, L. Wörner, G. Max-Planck-Institut für Chemie (MPIC) Max-Planck-Gesellschaft Institut für Geowissenschaften Mainz Johannes Gutenberg - Universität Mainz (JGU) Centre de Recherches Pétrographiques et Géochimiques (CRPG) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Georg-August-University Göttingen 1996-11 https://hal.univ-lorraine.fr/hal-02970609 https://hal.univ-lorraine.fr/hal-02970609/document https://hal.univ-lorraine.fr/hal-02970609/file/1-s2.0-S0012821X96001781-main.pdf https://doi.org/10.1016/S0012-821X(96)00178-1 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/S0012-821X(96)00178-1 hal-02970609 https://hal.univ-lorraine.fr/hal-02970609 https://hal.univ-lorraine.fr/hal-02970609/document https://hal.univ-lorraine.fr/hal-02970609/file/1-s2.0-S0012821X96001781-main.pdf doi:10.1016/S0012-821X(96)00178-1 http://creativecommons.org/licenses/by-nd/ info:eu-repo/semantics/OpenAccess CC-BY-ND ISSN: 0012-821X Earth and Planetary Science Letters https://hal.univ-lorraine.fr/hal-02970609 Earth and Planetary Science Letters, Elsevier, 1996, 144 (3-4), pp.529-545. ⟨10.1016/S0012-821X(96)00178-1⟩ Ferrar Group flood basalts magma contamination geochemistry [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology info:eu-repo/semantics/article Journal articles 1996 ftccsdartic https://doi.org/10.1016/S0012-821X(96)00178-1 2021-10-23T23:49:33Z International audience OS, Sr, Nd, Pb and 0 isotopes and trace element data are reported for basaltic andesite and andesite whole rocks and, in part, for selected mineral separates from the Jurassic Ferrar flood basalt province. Radiogenic Sr (> 0.709), unradiogenic Nd (e Nd =-3 to-5), and radiogenic Pb isotopes, as well as low Nb/La ratios of 0.4-0.6 and Nb/La ratios between 0.45 and 0.6 are found for all rocks including our most primitive sample (Mg# = 7 1.9). This indicates involvement of either continental crust or enriched lithospheric mantle in magma genesis. 's'Re/ '*sOs correlates strongly with '*'OS/ 'ssOs, with an age of 172 + 5 Ma, in agreement with published Ar-Ar data. Initial '*'OS/ '**OS of 0.194 + 0.023 is close to the range of typical mantle values for MORB, OIB and lithospheric mantle and much lower than that of continental crust. 6 "0 values between 5%a and 7%~ were obtained on fresh bulk samples, separated plagioclases and clinopyroxenes. Sr-0 and Sr-0s isotope mixing calculations between depleted mantle peridotite or mantle melts and crustal material rule out assimilation involving basalts with low OS concentrations, and simple binary mixing or pure AFC processes involving pi&es. AFC processes, combined with continuous replenishment of picritic magmas, can explain the isotopic data, provided the crustal end-member has high s'Sr/ 86Sr and low S'*O values. However, lower crustal samples displaying these characteristics are absent in the Ferrar region, and are also unlikely to impart the sediment-like trace element patterns observed in the Ferrar data. A more likely explanation is a lithospheric source enriched by subducted sediments. A contribution to Ferrar magmatism from a plume cannot be distinguished. Article in Journal/Newspaper Antarc* Antarctica Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Earth and Planetary Science Letters 144 3-4 529 545 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Ferrar Group flood basalts magma contamination geochemistry [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology |
spellingShingle |
Ferrar Group flood basalts magma contamination geochemistry [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology Molzahn, M. Reisberg, L. Wörner, G. Os, Sr, Nd, Pb, O isotope and trace element data from the Ferrar flood basalts, antarctica: evidence for an enriched subcontinental lithospheric source |
topic_facet |
Ferrar Group flood basalts magma contamination geochemistry [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology |
description |
International audience OS, Sr, Nd, Pb and 0 isotopes and trace element data are reported for basaltic andesite and andesite whole rocks and, in part, for selected mineral separates from the Jurassic Ferrar flood basalt province. Radiogenic Sr (> 0.709), unradiogenic Nd (e Nd =-3 to-5), and radiogenic Pb isotopes, as well as low Nb/La ratios of 0.4-0.6 and Nb/La ratios between 0.45 and 0.6 are found for all rocks including our most primitive sample (Mg# = 7 1.9). This indicates involvement of either continental crust or enriched lithospheric mantle in magma genesis. 's'Re/ '*sOs correlates strongly with '*'OS/ 'ssOs, with an age of 172 + 5 Ma, in agreement with published Ar-Ar data. Initial '*'OS/ '**OS of 0.194 + 0.023 is close to the range of typical mantle values for MORB, OIB and lithospheric mantle and much lower than that of continental crust. 6 "0 values between 5%a and 7%~ were obtained on fresh bulk samples, separated plagioclases and clinopyroxenes. Sr-0 and Sr-0s isotope mixing calculations between depleted mantle peridotite or mantle melts and crustal material rule out assimilation involving basalts with low OS concentrations, and simple binary mixing or pure AFC processes involving pi&es. AFC processes, combined with continuous replenishment of picritic magmas, can explain the isotopic data, provided the crustal end-member has high s'Sr/ 86Sr and low S'*O values. However, lower crustal samples displaying these characteristics are absent in the Ferrar region, and are also unlikely to impart the sediment-like trace element patterns observed in the Ferrar data. A more likely explanation is a lithospheric source enriched by subducted sediments. A contribution to Ferrar magmatism from a plume cannot be distinguished. |
author2 |
Max-Planck-Institut für Chemie (MPIC) Max-Planck-Gesellschaft Institut für Geowissenschaften Mainz Johannes Gutenberg - Universität Mainz (JGU) Centre de Recherches Pétrographiques et Géochimiques (CRPG) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Georg-August-University Göttingen |
format |
Article in Journal/Newspaper |
author |
Molzahn, M. Reisberg, L. Wörner, G. |
author_facet |
Molzahn, M. Reisberg, L. Wörner, G. |
author_sort |
Molzahn, M. |
title |
Os, Sr, Nd, Pb, O isotope and trace element data from the Ferrar flood basalts, antarctica: evidence for an enriched subcontinental lithospheric source |
title_short |
Os, Sr, Nd, Pb, O isotope and trace element data from the Ferrar flood basalts, antarctica: evidence for an enriched subcontinental lithospheric source |
title_full |
Os, Sr, Nd, Pb, O isotope and trace element data from the Ferrar flood basalts, antarctica: evidence for an enriched subcontinental lithospheric source |
title_fullStr |
Os, Sr, Nd, Pb, O isotope and trace element data from the Ferrar flood basalts, antarctica: evidence for an enriched subcontinental lithospheric source |
title_full_unstemmed |
Os, Sr, Nd, Pb, O isotope and trace element data from the Ferrar flood basalts, antarctica: evidence for an enriched subcontinental lithospheric source |
title_sort |
os, sr, nd, pb, o isotope and trace element data from the ferrar flood basalts, antarctica: evidence for an enriched subcontinental lithospheric source |
publisher |
HAL CCSD |
publishDate |
1996 |
url |
https://hal.univ-lorraine.fr/hal-02970609 https://hal.univ-lorraine.fr/hal-02970609/document https://hal.univ-lorraine.fr/hal-02970609/file/1-s2.0-S0012821X96001781-main.pdf https://doi.org/10.1016/S0012-821X(96)00178-1 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ISSN: 0012-821X Earth and Planetary Science Letters https://hal.univ-lorraine.fr/hal-02970609 Earth and Planetary Science Letters, Elsevier, 1996, 144 (3-4), pp.529-545. ⟨10.1016/S0012-821X(96)00178-1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0012-821X(96)00178-1 hal-02970609 https://hal.univ-lorraine.fr/hal-02970609 https://hal.univ-lorraine.fr/hal-02970609/document https://hal.univ-lorraine.fr/hal-02970609/file/1-s2.0-S0012821X96001781-main.pdf doi:10.1016/S0012-821X(96)00178-1 |
op_rights |
http://creativecommons.org/licenses/by-nd/ info:eu-repo/semantics/OpenAccess |
op_rightsnorm |
CC-BY-ND |
op_doi |
https://doi.org/10.1016/S0012-821X(96)00178-1 |
container_title |
Earth and Planetary Science Letters |
container_volume |
144 |
container_issue |
3-4 |
container_start_page |
529 |
op_container_end_page |
545 |
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1766212387046686720 |